Probably the same reason GM had old assmebly lines and equipment - it would save money in the long run but cost in the short run and short run is often what is looked at both in budget and idealism.
Lensman scale: Lets say, 42.
No, really, I have no idea, 4-5.
I'll believe when I see it.
"I don't lack attention span, I just lack a tuning device."